Fastener



Sept. 6, 1927. v 835 L. P. ARMSTRONG FASTENER Filed NOV. 2. 1925 \INVENTCR ATTORNEY I Patented Sept. 6, 1927.

Qumran STAT S* 'LYMAN r. ARMSTRONG, been osn; cALIroniiIA.

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' Application filed November 2, 1925. f Serial No. 66,318.

One object of the invention'is to provide a fastener for joining the edges of fabrics or any similar flexible material that will not pull off when the fabric is put through a wring'er, nor wear through the fabric. 7

Another, object is to provide a fastener that may be applied to'the fabric without;

the use of needle or thread. a

Another object is to provide a fastener that grips a relatively large portion of the fabric instead of a few threads as of the ordinary fastener. a

' Still another object is to provide a fastener that will not become loose except by manually twisting one partrelative to the other.

- 1 And rfinally, it is an object to provldea fastener that is simple in form and construction, economical to 'manufactureiand highly eflicient in its practical application.

.In the drawing 1 Figure 1' is a perspective illustration of the two parts'embodying my inventlon.

Figure 2 is a plan view'of a blank form showing .how the ,parts .may be cut from sheet-material. c

Referring more particularly to the drawing, the blank for one part of the fastener is formed of a triangular piece of sheet metal as 1 provided with a saw-tooth edge 2. The apex of the triangle, opposlte to the teeth 2,-is provided with an extension 3 provided with lateral extensions 44.- and end portion 5.

In forming this part for use the teeth 2 are bent at substantially right angles to the 1 plane of part 1, and the part 3+5 isbent in the same direction and at substantially right angles to the plane of-part 1 along line 6. This" end portion is also folded over along line 7 so that edges 8 and 9" of parts H are in alignment, and end portion. 5'

lies fiat against part 3. This formation is clearlyshown in Figure 1.

The other part of the fastener is formed of a triangular piece of sheet metal 8 having a saw-tooth edge 9 formed along one side, the apex of the triangle opposite to edge 9 terminating in a blunt edge 10.

in the case A rectangular cut 111213 is made in equal to the total width of partr4+3+4 of part1, and; preferably lying parallel with one sideeclge of part 8 and adjacent thereto.

Another cut 15. is shown connecting with cut 14 adjacent to the rearward end thereof and extending backwardly and angularly therefrom to a pointlG;

In forming this part 8 for use, the teeth 9 are bent at substantially right angles thereto as shown and the lip-17 formed by cuts 11'12-13 is bent in the same 'direc tion along line 1-8'asshown. Thelips 19- -20 formed by cuts-1415 ,are bent in the opposite direction and at, substantially right anglesto the plane of part 8 along lines clearly'shown.inF-igure 1. 1 g

. In using thefastener. the teeth are thrust is twisted slightly relative to the other and the folded end portion 315 on fastener part 1 inserted through orifice 24; in part' 8, the upstanding lips l920 guiding the same into position when the fastener is so positioned that it can not be readily seen by the user. When these parts are engaged the natural pull of the cloth will cause the parts 3-45 to slide'down into their seat in orifice 25 and bearing against lip 17.

The fastening may be readily separated by a reversal of this process,-but due to its peculiar' formation and interlocking feature this reversal can only be successfully carried out by manual manipulation of the parts.

This fastener is economical to manufacture as it may be readily stamped out of sheet metal with but little waste, the cut forming one set of teeth as 2 also forming the other set 9, and the parts out to form orifices 24-25 functioning as guides in case of lips 1920 and as a seat for the hook portion 3t5 in the'case of lip 17. The triangular formation provides along edge for fastening to the cloth, and a small angular locking portion.

One of the most important features of this invention is in the formation of the teeth 2 and 9. In this construction the points of the teeth are inclined toward one side 7 22,?1fespectively. -This part of the .fas.-' tener when out and formed as described is edge and overlap their base portions so as to provide notches wherein the threads of the cloth are bunched when the teeth are thrust through the cloth. Pounding down the teeth curves the tips first and causes the teeth to cross the bunched threads and bind the fastener part securely in position.

By constructing the device as described the two parts are almost identical in form, and the blanks may be out from sheet metal as shown in Figure 2 with practically no waste.

Orifices 26 are also provided in these parts 1 and 8 adjacent the toothed edges 2 and 9, so that they may be sewed in position if so desired, to avoid having the teeth either seen or felt when they are not placed on a hein or facing.

I claim 1. A fastener comprising two relatively thin triangular elements having interlocking devices formed on opposing a-pices, the edge of each element opposite to its locking apex being sharply serrated, with teeth inclined toward one side edge of the element and turned at an angle to the plane of the fastoner.

2. A fastener comprising two relatively thin triangular elements, each element having fastening means formed along one edge thereof one element having a hook formed on the apex thereof opposite the fastening edge, and the other element having a slot formed in the apex thereof opposite the fastoning edge and adapted to receive the said hook, the said slot having a portion lying substantially parallel with the said fastening edge and a portion lying substantially parallel with one side of said triangular element, the part removed from said first named portion of the slot being bent at right angles to the plane of the element on one side thereof, and the parts removed to form said second named portion being bent at an angle to the plane of the element on the opposite side thereof.

3. A fastener comprising two relatively thin triangular elements, each element having :t'astening means formed along one edge thereof, one element having a hook formed on the apex thereof opposite the fastening edge, and the other element having a slot formed in the apex thereof opposite the fastening edge and adapted to receive the said hook the said slot l'iaving a portion lying substantially parallel with. the said fastening edge and a portion lying substantially parallel with one side of said triangular element, the part removed from said first named por tion of the slot being bent at an angle to the plane of the element on one side thereof and adjacent to the apex thereof, and the parts removed to form said second named slot portion being bent at an angle to the plane of the element on the opposite side thereof and on the edges remote from the adjacent edge of the element.

LYMAN P. ARMSTRON 

